The Rangers have released veteran first baseman Carlos Pena from their Triple-A roster, per the PCL transactions page. Pena struggled at the major league level for Texas with a .136/.190/.237 line in 63 plate appearances. He performed better during his month at Triple-A with a .297/.350/.500 line in 80 plate appearances. No word on why the club cut ties with Pena.

The Mariners have released right-handed pitcher Matt Palmer from the Triple-A Rainiers, according to the PCL transactions page. The 35-year-old pitched to a 5.42 ERA for the Rainiers over 73 innings. He last appeared in the majors with the Padres in 2012. Angels fans may remember him from his 2009 season, when he won 11 games and posted a 3.93 ERA over 121 innings.

Resolving an earlier bit of news, the Tigers have outrighted the contract of right-handed pitcher Kevin Whelan to Triple-A. The 30-year-old appeared once for the big league club and allowed two runs over one and one-third innings. Prior to his call up, he served as the closer for the Mud Hens, where he posted a 2.45 ERA, 10.93 K/9, and 4.02 BB/9. Presumably, he will return to that role. The team announced the move on Twitter.

The Brewers have signed right-hander Billy Buckner to a minor league contract, tweets Chris Cotillo of MLBDailyDish.com. The 30-year-old was released two weeks ago by the Padres. Buckner made one spot start for San Diego this season allowing three runs on six hits in 5 2/3 innings and, in 15 appearances (14 starts) for Triple-A El Paso, has posted a 5.80 ERA, 6.2 K/9, and 4.7 BB/9 in 63 2/3 innings.

Cotillo also tweets the Diamondbacks have released outfielder Aaron Cunningham from their Triple-A affiliate. The 27-year-old, who signed a minor league deal with Arizona in March, slashed .255/.342/.346 in 281 plate appearances for Reno. Cunningham hasn’t appeared in a MLB game since 2012 when he hit .175/.245/.247 for the Indians in 109 plate appearances.